Console.WriteLine("———————————————————————————————————————————");
Thread t = Thread.CurrentThread;
t.Name = "Main Thread";
Console.WriteLine(t.Name);

CodeaftThread1 ct1 = new CodeaftThread1();
Thread A = new Thread(new ThreadStart(ct1.thread));
Thread B = new Thread(new ThreadStart(ct1.thread));
A.Start();
B.Start();

CodeaftThread2 ct2 = new CodeaftThread2();
Thread C = new Thread(new ThreadStart(ct2.thread));
Thread D = new Thread(new ThreadStart(ct2.thread));
C.Start();
D.Start();
Console.WriteLine("\n———————————————————————————————————————————");

class CodeaftThread1
{
    public void thread()
    {
        for (int i = 100; i < 105; i++)
        {
            Console.Write(i + " ");
        }
    }
}

class CodeaftThread2
{
    public void thread()
    {
        for (int i = 0; i < 5; i++)
        {
            Console.Write(i + " ");
        }
        Console.WriteLine();
    }
}

codeaft@codeaft:~/csharp$ dotnet run
———————————————————————————————————————————
Main Thread
100 101 102 103 104 
———————————————————————————————————————————
100 101 102 103 104 0 1 2 3 0 4 1 2 3 4 
codeaft@codeaft:~/csharp$